Press.



No. 893,601. PATENTED JULY 21, 1908.

' G. J. BLUM.

PRESS.

APPLICATION FILED APR. 22, 1907.

2 SHEETS-SHEET 1.

PATENTED JULY 21 G. J. BLUM.

PRESS. APPLICATION FILED APR. 22, 1907.

2 SHEETS-SHEET 2.

UNITED STATES PATENT canoe.

GEORGE .I. BLIIM, OF CHICAGO, ILLINOIS, ASSIGNOR TO ARMSTRONG-BLUM MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PRESS.

No. 898,601. Specification of Letters Patent. Patented July 21, 1908 Application filed April 22, 1907. Serial No. 369,435. To all whom it may concern: stra embracing the eccentric portion 6 of the shaft 5, the upper strap portion 15 being attached to the connecting rod 12 by means of screws 16. In Fig. 4 the upper strap portion 15 is omitted.

The tool-carrier 8 has formed in its forward side a recess 17 having an inclined upper wall 18. In the lower end of the tool-carrier is formed a plurality of openings 19 communi eating with the recess 17, said openings being adapted to receive punches at having shanks of standard size, and heads adapted to prevent their slipping through the openings 19. Each of the punches at which it is desired to use at any particular time is fixed in its opening 19 by means of a block 20 adapted to rest upon the head of said punch, said block having an inclined upper side 21 adapted to contact the inclined upper wall 18 of the recess 17. The angle between the inclined upper wall of the recess 17 and the line of force exerted by the punches is preferably made so nearly a right angle that the block 20 will not be forced from the recess 17 by the upward pressure of the punches, but I have herein shown positive means for holding said block against displacement, said means comprising a screw 22 extending through an elongated opening 23 in said block and engaging a screw-threaded opening in the tool-carrier 8. When said screw is drawn up, the wedging action of the inclined surfaces 18 21 forces the punch a firmly into its seat and holds it rigidly in place.

24 is a stripper secured in the frame 1 and having openings 25 therein through which the punches a extend.

The female dies b are setin the portion of the frame 1 at the lower side of the throatway 2. Said dies communicate with passages 26 opening upon the forward face of the frame below the dies, said passages forming outlets for the punchings.

The means for rocking the eccentric shaft 5 to force the punches a through the work comprises a crank arm 27 secured to said shaft in any suitable way, as by being mounted Be it known that I, GEORGE J BLUM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Presses, of which the following is a specification.

One of the objects of this invention is the roduction of an improved mechanism for actuating punch presses, shears, and other machinery.

Another object of the invention is the production of an improved means for mounting punches and other tools in a press or analogous machine.

The invention also relates to the other and further improvements in presses hereinafter set forth.

In the accompanying drawings, Figure 1 is a side elevation of a punch press embodying the features of my invention. Fig. 2 is a front elevation of said machine with portions thereof in section. Fig. 3 is an elevation of said machine from the side opposite to that seen in Fig. 1, with parts broken away. Fig. 4 is a top plan view of the machine with certain parts omitted. Figs. 5 and 6 represent alternative constructions. Fig. 7 is a detail view illustrating the means for securing the punches in place.

The frame 1 of the machine may be of any common or preferred construction. In the present instance, it is provided with a threatway 2 in its forward side, and bearings 3 and 4 in its upper portion. A shaft 5 is rotatably mounted in the bearings 3 and 4, said shaft having an eccentric portion 6 between said bearings. In a guideway 7 in the forward part of the framework is slidably mounted a tool-carrier 8 held in place, in this instance, by means of a cap screw 9 extending through an elongated opening 10 in said tool carrier into an opening 11 in the frame. Said toolcarrier is herein shown as arranged to be reciprocated vertically in its guide-way 7 by the shaft 5 through the medium of a connecting rod 12 having a substantially cylindrical portion 13 at its lower end which 1s roupon the squared end 28 of said shaft. If detatably mounted in a groove 14 in the upper sirable, means may be provided for holding end of the tool-carrier 8, said groove having said crank arm upon said shaft. In the present instance, I have shown a screw 29 seated in the squared end of said shaft, the head of said screw overlying a part of the crank arm to hold the latter in place, and a portion of overhanging walls adapted to retain the cylindrical portion 13 in engagement with said tool-carrier. The upper part of the connect ing rod 12 forms a portion of an eccentric said screw-head being cut away so that when said screw is turned in the appropriate direction said crank arm may be slipped off the shaft. In the upper end of the crank arm 27 is a bearing opening 30 receiving the pivot 31 of a socket member 32. The socket member 32 is adapted to receive the lower end of an operating lever 33, said lever having a pin 34 extending therethrough and extending also through a slotted opening 35 in the socket member 32, which pin is adapted to enter a notch 36 in the rounded upper end of the crank arm 27. At each side of said notch is a stop lug 37, the purpose of which will appear hereinafter. When the pin 34 lies in the notch '36 the socket member 32 and the crank arm-27 are held from movement with relation to each other. Taking hold of the operating lever 33, the operator may draw said lever forwardly, said lever, socket member and crank arm turning as one member with the shaft 5 for its pivot. By means of such a forwardly-tilting movement of the lever 33 the operator may exert suflicient force to carry the punches a through comparatively light work. To enable the operator to exert enough force to operate upon very heavy material, I have provided the mechanism to be now described.

In the lower end of the socket member 32 is a transverse groove 38 communicating with the interior of said socket member. Within said groove a pawl 39 is mounted by means of a pivot screw 40 extending through said pawl at a point between its ends, said screw having a milled head 41. The pawl 39 has a plane upper side adapted to be contact ed by the lower end of the operating lever 33 when the pin 34 lies in the notch 36, for holding said awl in the position shown in Fig. 1. The paw 39 is arranged to engage with the teeth of a ratchet member fixed in the machine-frame concentric with the shaft 5.

In Figs. 1 and-2 I have shown a ratchet member in the form of a disk 42 having a hexagonal opening 43 therein adapted to receive a hexagonal extension 44 of the bearing 4. In Fig. 2 I have shown an alternative construction comprising a loop 45 having ratchet teeth upon its outer side and ada ted to fit over the portion 46 of the mac ine frame. Upon the opposite ends of the loop 45 are formed hooks 47 adapted to engage with shoulders or projections 48 upon the frame. If desirable, the loop 45 may be se cured in place by means of screws 49.

Assuming the parts to be in the position shown in Fig. 1 the operation is as follows: The operator swings the lever 33 and the crank arm 27 forwardly, rotating the shaft 5, and forcing the punch or punches at that are fixed in position by blocks 20, into contact with or through the work. If the material is so thick or hard that the operator can not force the punch through it'by continuing the forward movement of the lever 33, he raises said lever in the socket member 32 until the pin 34 is out of its notch 36 and the pawl 39 drops by gravity into engagement with a tooth of the ratchet member 42. The lever 33 and the socket member 32 are now free to oscillate with reference to the crank arm 27, the stop lugs 37 limiting the oscillations of said socket member.

By reference to Fig. 3 it will be seen that the pawl 39 and socket member 32 form a jointed arm which, when being straightened, acts powerfully to force apart the pivot 31 and the ratchet tooth engaged by said pawl. After throwing the lever 33 upwardly and rearwardly until the members 32 and 39 are in flexed relation, the operator pulls said lever forwardly, 32 upon its pivot 31, and bringing said pivot, the pivot. 40 for the pawl, and the ratchet tooth engaged by said pawl into alinement, the crank arm 27 being moved forwardly and downwardly as said points come into alinement. oscillates the be necessary, through the large sheet or other bulky piece of material is being operated upon it may be convenient or necessary for the operator to operate the lever 33 from the rearof the machine. To permit of thus operating the machine, the ratchet member 42 45 and the pawl 39 are made reversible in position. By first removing the crank arm 27, the ratchet member 42 45 may be slipped off its supporting member 44 46, reversed and replaced. To reverse the pawl 39, the pivot screw 40 is removed, said pawl reversed, and the pivot screw replaced. The position of the crank arm 27 with reference to the eccentric por- In a like manner, the operator lever 33 as many times as may the punches being advanced rocking the socket member work step by step. When a tion 6 of the shaft 5 may be changed by taking the arm 27 ofi the square portion 28 position.

In Fig. 6 is shown an alternative construction of pawl and ratchet which obviates the necessity for removing the ratchet member and the pawl the direction of operation of the lever 33. A member 50 having a peripheral series of square teeth 51, is fixed in concentric with the shaft 5, in any suitable way. The teeth 51 are adapted for engagement by a double-ended pawl 52 pivoted at its middle portion in the socket member 32. Upon the upper side of said pawl member is a projectlon 53 against which the lower end of the lever 33 rests to hold said pawl out of engagement with the teeth 51. A coiled sprin 54 attached at one end to the socket mem er 32 and adapted at its other end to engage a pin 55 fixed in each end of the pawl 52 provides means for holding either end of said pawl in engagement with when it is desired to reverse the machine frame the teeth 51, when the lever 33 is raised in the socket member to permit of such engagement.

It is evident that various changes may be 2. In an actuating mechanism, in combi nation, a shaft to be driven; a member on said shaft; a stationary member; and a jointed arm attached to the first mentioned member and bearing at its other end against said stationary member.

3. In an actuating mechanism, in combination, a shaft to be driven; a crank arm fixed to said shaft; a stationary member; and means attached to said 'crank arm for forcing apart said crank arm and said stationary member.

4. In an actuating mechanism, in combination, a shaft to be driven; a crank arm on said shaft; a stationary member; and a jointed arm attached to said crank arm and bearing at its other end upon said stationary member.

5. In an actuating mechanism, in combi nation, a shaft; a crank arm on said shaft; a stationary toothed member; and a jointed arm, one member of which is arranged to bear against said crank arm, the other member of said jointed arm being a pawl adapted to bear against said toothed member.

6. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; a member pivotally mounted on said crank arm; a stationary toothed member; and a awl carried by said pivoted member and adapted to engage said toothed member.

7. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; a member pivoted to said crank arm; a stationary toothed member; a pawl carried by said pivoted member adapted to engage said toothed member; and means for holding said pawl out of engagement with said toothed member.

8. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; a member pivoted to said crank arm; a pawl pivoted to said pivoted member; a stationary toothed member arranged to be engaged by said pawl; and means for locking said pivoted member against movement with relation to said crank arm, and for holding said pawl out of engagement with said toothed member.

9. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; a stationary toothed member, a pawl connected with said crank arm and adapted to engage said toothed member; and a lever for rotating said crank arm, said lever being adapted to hold said pawl out of engagement with said toothed member.

10. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; means including a member pivoted to said crank arm for moving said crank arm; and means for locking said member from movement with relation to said crank arm.

11. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; means for moving said crank arm comprising a socket member movable with relation to said crank arm; and a lever adapted to be received in said socket member, said lever having means adapted to engage said crank arm for preventing movement between said crank arm and said socket member.

12. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; means for moving said crank arm comprising a socket member pivoted to said crank arm; a lever adapted to be received in said socket member; and a pin fixed to said lever and adapted to enter a locking notch in said crank arm.

13. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; means for moving said crank arm com rising a socket member pivoted to said cran arm; a lever adapted to be received in said socket member; and a pin fixed to said lever and adapted to enter a locking notch in the free end of said crank arm, said pin being adapted to-ride upon the free end of said crank arm at one side of said notch.

14.. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; and a single means comprising members reversible in position for imparting a series of partial rotations to said crank arm in either direction.

15. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; a jointed arm for imparting a series of partial rotations to said crank arm in either direction; and a fixed abutment for one end of said jointed arm, said abutment and one member of said ointed arm being reversible in position.

16. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; a stationary, reversibly-mounted, toothed member; and a reversible pawl connected with said crank arm and adapted to engage said toothed member.

17. A. lever-actuated press adapted for actuation by movement of the lever toward the front or rear of the machine, said press comprising an actuating shaft, a crank arm adjustably mounted on said shaft, a stationary member, and a jointed arm bearing at one end upon said crank arm, the other end of said jointed arm being adapted to bear upon said stationary member at opposite sides of said shaft.

18. In an actuating mechanism, in combination, a shaft; a crank arm adjustably mounted on said shaft; and a single means, comprising members reversible in position, for moving said crank arm to either side of said shaft.

19. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; a jointed arm for moving said crank arm, said jointed arm comprising a hand lever pivotally connected to said crank arm; and

means for rigidly connecting said hand lever I With said crank arm.

20. In an actuatlng mechanism, 1n combination, a shaft to be driven; a crank arm on said shaft; a series of stationary teeth arranged concentric with the axis of said shaft;

a jointed arm connected at one end to said crank arm and adapted to bear at its other end upon said teeth and means for flexing and straightening said jointed arm.

21. In an actuating mechanism, in combination, a shaft; a crank arm on said shaft; a hand lever pivotally connected With said crank arm; means cooperating With said hand lever for imparting a series of partial rotations to said crank arm; and means for locking said hand lever from pivotal movement With relation to said crankarm.

GEORGE J. BLUM.

I Witnesses:

C. PAUL PARKER, GEORGE L. CHINDAHL. 

